Practice exam 1 Chem

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karlap
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296521
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Practice exam 1 Chem
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2015-02-22 16:03:27
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Practice exam Chem
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Practice exam 1 Chem
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  1. J.J Thomson is credited with discovering the electron: T/F
    TRUE
  2. Two isotopes of the same element can have a different number of protons:T/F
    FALSE
  3. Two isotopes of the same element can have a different number of electrons: T/F
    TRUE
  4. The symbol for magnesium is Mn : T/F
    FALSE
  5. As5+ has 33 protons and 28 electrons : T/F
    TRUE
  6. The answer to the following mathematical operation (18.5-11.4) has three significant figures: T/F
    FALSE
  7. A homogeneous mixture can be made by completely dissolving salt into water : T/F
    TRUE
  8. It is impossible to round 45,629.54 to three significant figures : T/F
    FALSE
  9. The density of a pure compound changes depending on how much liquid is present: T/F
    FALSE
  10. A mass of 456.2 g of brass (72% copper, 28% zinc) contains 328.5 g zinc: T/F
    FALSE
  11. An increase of 1°F corresponds to an increase of 1.8°C : T/F
    FALSE
  12. A hypothesis will predict the outcome of all future experiments : T/F
    FALSE
  13. Perform the following calculations and indicate the results to the correct number of significant figures:
    1.24 x 3.796 =
    4.70704 = 4.71
  14. Perform the following calculations and indicate the results to the correct number of significant figures. 
    4.17 + 13.1 + 6.14 =
    23.41 = 23.4
  15. Perform the following calculations and indicate the results to the correct number of significant figures. 
    (14.35 – 7.12) x (12.3 + 3.58) =
    7.23 x 15.88 = 114.8124 = 115
  16. convert to standard:
    1.403 x 103
    1403
  17. covert to standard:
    2.85 x 10-4
    0.000285
  18. covert to standard:
    1.67 x 10-2
    0.0167
  19. convert to scientific notation:
    1.259 x 103
    1259
  20. convert to scientific notation:
    4.6 x 10-3
    0.0046
  21. convert to scientific notation:
    2.10006 x 101
    21.0006
  22. 523 nm to m
    • 523nm x 10-9   = 5.23 x 10-7 m
    •                1nm
  23. 219 K to°F
    • °C = 219-273 =54°C
    •  °F= (-54 x 1.8) +32= -65.2°F
  24. 66 mi/hr to km/s
    • 66mi x 1.609km x 1hr   x 1min = 0.029km/s
    •     hr       1.0mi   60min    1sec
  25. 1 year to seconds (Scientific Notation)
    • 1yr X 365.2days X 24hr X 60min X 60s=3x107s
    •              1yr          1day      1hr    1min
  26. Magnesium has three naturally occurring isotopes 24Mg (78.99%), 25Mg (10.00%), and 26Mg (11.01%).  What is the isotopic mass of 25Mg if the mass of 24Mg is 23.985 amu and the mass of 26Mg is 25.983 amu?
    • 23.985amu (0.7899) + x(0.100)
    • + 25.938amu (0.1101) = 24.31amu

    • x= 24.31amu - 18.946 - 2.856= 25.08amu
    •                       0.100

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